Hello Alexish,
Makmur Arts is an antique shop in Bukittinggi which I visited more than 20 years ago, if you are connected to them in any way please be advised that this is against the rules of this Forum.
Regards

Hello Alexish,
I am not sure but this specific style with a hole under the naga head seems to be Malay/ Sumatrese, see pic. Primitive naga blades are also found in Java with a different style but some of them may not be original (naga head carved later).
Regards

Hello Alexish,
I am not sure but this specific style with a hole under the naga head seems to be Malay/ Sumatrese, see pic. Primitive naga blades are also found in Java with a different style but some of them may not be original (naga head carved later).
Regards

Dear Jean,

Please see attached image. There seems to be Banjar, Javanese and Pattani versions of this hole motif.